Query diagnostics

Another tool that you can use to study query performance is query diagnostics. You can determine what bottlenecks may exist while loading and transforming your data, refreshing your data in Power Query, running SQL statements in Query Editor, and so on.

To access query diagnostics in Power Query Editor, go to Tools in the Home ribbon. When you're ready to begin transforming your data or making other edits in Power Query Editor, select Start Diagnostics in the Session Diagnostics section. When you're finished, make sure that you select Stop Diagnostics.

Selecting Diagnose Step shows you the length of time that it takes to run that step, as shown in the following image. This selection can tell you if a step takes longer to complete than others, which then serves as a starting point for further investigation.

This tool is useful when you want to analyze performance on the Power Query side for tasks such as loading semantic models, running data refreshes, or running other transformative tasks.


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